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Alrighty, I just checked it out. The quiz no longer crashes but MIDI is still unresponsive. The issue seems to be that once a MIDI key triggers, it doesn't untrigger and won't register when I press it again. Whenever I press a key, it goes blue and stays blue. Only resetting the program will change it back. I can still press the keys on the virtual keyboard using the mouse, however.

Okay, great! Will do. 

Hey man, I don't know how much you've tested this on Windows 10, but it's pretty much non-functional. MIDI is close to non-responsive and going into quiz mode crashes the app completely.